<template>
	<view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item" :class="[current==index ? 'u-tab-item-active' : '']"
				 :data-current="index" @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{item.value}}</text>
				</view>
			</scroll-view>
			<block v-for="(item,index) in tabbar" :key="index">
				<scroll-view scroll-y class="right-box" v-if="current==index">
					<u-card :title="item.title" v-for="(item, index) in  list" :key="item.id" @click="toarticle(item.id)">
						<view class="" slot="body">
							<u-image width="100%" height="300rpx" :src="item.thumbnail"></u-image>
						</view>
					</u-card>
				</scroll-view>
			</block>
		</view>
	</view>
</template>

<script>
	export default {
		onLoad() {
			this.$u.api.postchecktype({
				type: this.tabbar[this.current].value
			}).then(res => {
				console.log(res)
				this.list = []
				this.list = res.data
			})
		},
		data() {
			return {
				tabbar: [{
						value: "程序人生",
						label: "程序人生",
					},
					{
						value: "游戏开发",
						label: "游戏开发",
					},
					{
						value: "移动开发",
						label: "移动开发",
					},
					{
						value: "研发管理",
						label: "研发管理",
					},
					{
						value: "计算机基础",
						label: "计算机基础",
					},
					{
						value: "运维安全",
						label: "运维安全",
					},
					{
						value: "前端架构",
						label: "前端架构",
					},
					{
						value: "后端架构",
						label: "后端架构",
					},
					{
						value: "算法研发",
						label: "算法研发",
					},
					{
						value: "Python开发",
						label: "Python开发",
					},
					{
						value: "软件测试",
						label: "软件测试",
					},
					{
						value: "Java开发",
						label: "Java开发",
					},
					{
						value: "产品设计",
						label: "产品设计",
					},
					{
						value: "原型设计",
						label: "原型设计",
					},
					{
						value: "音视频开发",
						label: "音视频开发",
					},
					{
						value: "人工智能",
						label: "人工智能",
					},
					{
						value: "软件工程",
						label: "软件工程",
					},
					{
						value: "大数据开发",
						label: "大数据开发",
					},
					{
						value: "操作系统",
						label: "操作系统",
					},
					{
						value: "数据分析",
						label: "数据分析",
					},
				],
				list: [],
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度,
				text: ""
			}
		},
		methods: {
			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if (index == this.current) return;
				this.current = index;
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
				}
				// 将菜单菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
				this.$u.api.postchecktype({
					type: this.tabbar[this.current].value
				}).then(res => {
					console.log(res)
					this.list = []
					this.list = res.data
				})
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({
						size: true
					}, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
					}).exec();
				})
			},
			toarticle(id) {
				this.$u.route('/pages/article/article', {
					id
				});
			},
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 18rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		height: 50rpx;
		font-size: 14rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}

	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}

	.u-tab-item-active::before {
		content: "";
		position: absolute;
		border-left: 4px solid $u-type-primary;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.page-view {
		padding: 16rpx;
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}

	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
	}

	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		color: $u-main-color;
	}

	.item-container {
		display: flex;
		flex-wrap: wrap;
	}

	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}

	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
</style>
